How To Change The "From" Section When Sending Emails

How To Change The "From" Section When Sending Emails

I'm trying to change the "from" section when I send emails so that instead of my personal username it says the name of my store. I have already gone into settings and updated the "send mail as" which you can see in the attachment, however when I send a test email it is still showing my old username. What else do I need to do to make this work?